Over 2,500 people had marked themselves on Facebook as having attended the Lake Travis Trump Boat Parade, which Dark said was three to five kilometres long. Multiple boats took on excess water, some capsized, and at least four completely sank.
Dark said that weather on the roughly 19,000-acre (7,690-hectare) lake was calm, but that the tightly packed boats created large waves in areas. "Several boats did sink".
The sheriff's office wrote on Twitter that its officers responded to multiple calls involving boats in distress during the event near Austin, Texas.
Kristen Dark, a spokesperson for the sheriff's office, told Agence France-Presse that there was no evidence of foul play.
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Currently, Guinness holds that the largest boat parade in history numbered 1,180 for a 2014 celebration in Malaysia. However, it was not clear how many people needed rescuing, he said. "When they all started moving at the same time, it generated significant waves", she explained to the New York Times.
Steve Salinas, 42, said that the water had been choppy and the swells had been high when he went to launch his 22-foot boat, decorated with 8-foot-tall flagpoles.
According to the event's Facebook page, the boats were set to travel around the lake at about 10 miles per hour.
Trump memorabilia, such as Make America Great Again flags and Trump/Pence signs, as well as American flags were pictured on many boats in attendance.